基于FPGA的频率周期及相位差测量的多功能计数器的实现

本文介绍了一种基于FPGA的多功能计数器，该计数器包括数字式频率周期测试仪、数字式相位测试仪两部分。数字式频率周期测试仪，通过FPGA实现频率周期的精确测量，结合单片机进行乘除法运算并显示；数字式相位测试仪通过FPGA实现对两路处理过的信号的等精度测量，结合单片机进行乘除法运算并显示。本多功能计数器模块化程度好、集成度高，具有友好人机交互界面且易于外部功能的扩展。

Multifunctional counter for measurement of frequence、period and phase difference based on FPGA

This paper introduces a multifunctional counter which contains two parts： digital measurement of frequence-period and phase difference of the signial. Digital frequence-period testing meter is based on FPGA for the correct measurement while digital phase difference testing meter is based on FPGA for same precision measurement. And the results are finally calculated by a singlechip and displayed on a LCD screen. This multifunctional counter is specially useful for its good modularization and high integration, also for its friendly man-machine conversation and extendible functions.